when it comes to

The phrase "when it comes to" is an idiomatic expression used to introduce a specific person, thing, action, or topic that is being considered or discussed. It essentially means "as for" or "with regard to" something. For example, "When it comes to fishing, John is an expert," means "As for fishing, John is an expert." It is often used to specify the particular area of focus in a conversation or statement. This phrase can also be used to mean "if or when it comes right down to" a situation, implying the essential or decisive aspect of something. It has been in use since the second half of the 1700s and is a friendly and informal way to address a specific topic or situation in speech or writing. Overall, "when it comes to" helps to draw attention specifically to a certain topic or situation relevant to the context being discussed.